To understand images and their layers, you can always inspect the image history. Let’s inspect the history of the last Docker image by running the following command: As you can see, there are several layers, and every layer has associated commands. You can also see when the layers were created and the size of the […]
Read More… from Image history – Creating and Managing Container Images
Imagine you’re a passionate chef dedicated to creating mouthwatering dishes that satisfy hungry customers. In your kitchen, which is a magical place called Docker, you have special powers to plan, make, and showcase your culinary creations. Let’s break down the key parts: Ingredients (Application Code and Dependencies): Imagine your kitchen has shelves filled with ingredients […]
Read More… from Docker architecture – Creating and Managing Container Images-1
In the previous chapter, we covered containerization with Docker, where we installed Docker and ran our first container. We covered some core fundamentals, including Docker volumes, mounts, storage drivers, and logging drivers. We also covered Docker Compose as a declarative method of managing containers. Now, we will discuss the core building blocks of containers: container […]
Read More… from Technical requirements – Creating and Managing Container Images
Use an .env file to store sensitive variables You might not want to store sensitive content such as passwords and secrets in version control. Instead, you can use an .env file that contains a list of variable names and values and keep it in a secret management system such as HashiCorp Vault. Be mindful of […]
Read More… from Be mindful of dependencies in production – Containerization with Docker
Docker Compose best practices Docker Compose provides a declarative way of managing Docker container configuration. This enables GitOps for your Docker workloads. While Docker Compose is primarily used in development environments, you can use it in production very effectively, especially when Docker runs in production and does not use another container orchestrator such as Kubernetes. […]
Read More… from Separate multiple environment YAMLs using overrides – Containerization with Docker
The next step in the process is to create a docker-compose file. A docker-compose file is a YAML file that contains a list of services, networks, volumes, and other associated configurations. Let’s look at the following example docker-compose.yaml file to understand it better: version: “2.4” services: flask: image: “bharamicrosystems/python-flask-redis:latest” ports: networks: redis: image: “redis:alpine” networks: […]
Read More… from Creating the docker-compose file – Containerization with Docker
Docker Compose helps you manage multiple containers in a declarative way. You can create a YAML file and specify what you want to build, what containers you want to run, and how the containers interact with each other. You can define mounts, networks, port mapping, and many different configurations in the YAML file. After that, […]
Read More… from Declarative container management with Docker Compose – Containerization with Docker
From a conceptual point of view, there is no difference between container monitoring and the traditional method. You still need metrics, logs, health checks, and service discovery. These aren’t things that are unknown or haven’t been explored before. The problem with containers is the abstraction that they bring with them; let’s look at some of […]
Read More… from Challenges with container monitoring – Containerization with Docker
Docker allows you to run multiple applications in a single machine or a cluster of machines. Most organizations run a mix of virtual machines and containers, and they have their logging and monitoring stack configured to support virtual machines. Most teams struggle to make Docker logging behave the way virtual machine logging works. So, most […]
You can create Docker containers out of Docker container images. While we will discuss container images and their architecture in the following chapters, an excellent way to visualize them is as a copy of all files, application libraries, and dependencies comprising your application environment, similar to a virtual machine image. To run a Docker container, […]
Read More… from Running your first container – Containerization with Docker